把下列各式因式分解:
(1)2x2﹣4x ;
(2)a2b2﹣a2c2;
(3)8a3b2﹣12ab3c+6a3b2c;
(4)8a(x﹣a)+4b(a﹣x)﹣6c(x﹣a);
(5)﹣x5y3+x3y5;
(6)(a+b)2﹣9(a﹣b)2;
(7)﹣8ax2+16axy﹣8ay2;
(8)5m(x﹣y)2+10n(y﹣x)3;
(9)(a2+1)2﹣4a2;
(10)m2+2n﹣mn﹣2m;
(11)(a2﹣4a+4)﹣c2;
(12)x2+6x﹣27;
(13)9+6(a+b)+(a+b)2;
(14)(x+3y)2+(2x+6y)(3y﹣4x)+(4x﹣3y)2。